diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2e16a8d894cf..5dfc3f0b5b49 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -281,6 +281,10 @@ jobs:
             env:
               RUST_BACKTRACE: 1
             os: ubuntu-20.04-xl
+          - name: x86_64-gnu-llvm-12-stage1
+            env:
+              RUST_BACKTRACE: 1
+            os: ubuntu-20.04-xl
           - name: x86_64-gnu-nopt
             os: ubuntu-20.04-xl
             env: {}
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 0dd4fc65792c..97688e1e5d4c 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -439,6 +439,11 @@ jobs:
               RUST_BACKTRACE: 1
             <<: *job-linux-xl
 
+          - name: x86_64-gnu-llvm-12-stage1
+            env:
+              RUST_BACKTRACE: 1
+            <<: *job-linux-xl
+
           - name: x86_64-gnu-nopt
             <<: *job-linux-xl